First and Last Frost Dates

See Frost Dates for Your Location

Use our frost dates calculator to find the average date of the last spring frost and first fall frost for locations across the U.S. and Canada. Simply enter your ZIP or Postal code in the field below to see frost dates for your location (based on the nearest weather station).

What are Frost Dates?

A frost date is the average date of the first or last light freeze that occurs in spring or fall. Note that local weather and topography may cause considerable variations. The probability of frost occurring after the given spring dates and before the given fall dates is 30 percent.

The classification of freeze temperatures is based on their effect on plants: